2001 Toyota Seinna - cabin air filter - does it have one? if so ow to change it? Bad smell when first running Air or espeically the heater, doesn't smell like a dead animal but not pleasent either! just smell musty and dirty. can't be too healthy

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1) Turn off the ignition switch while leaving the wipers in the up position. 2) Open the hood and properly secure it in the open position. 3) Gently pull the rubber cowl seal away from the cowl vent screen. Place your hand underneath the right half of the cowl vent screen and lift straight up, thereby releasing the four spring clips and removing the right half of the screen 4) Remove the water shield. Carefully disengage the two water shield locking tabs and slide the water shield toward the front of the vehicle, lifting the water shield up and away from the vehicle 5) Remove the Passenger Compartment Air Filter, being careful not to allow debris or loose components to fall into the filter housing. Replace the Passenger Compartment Air Filter with a fresh filter and reverse the above procedures to reassemble the vehicle components. �I am not sure what time in the year your 2001 Avalon was built but her is the procedure that I just followed: 1. Open glove box and remove contents 2. Remove the three philips head screws along the top inside frame of the glove box. 3. Remove the hex head bolt in the lower right and Philips screw in the lower left side of the glove box frame. 4. Unlatch the black cover plate from the roof of the glove box. This holds an electrical connection and will need pushed up through the hole when the entire box is removed. 5. Pull on the top left side of the glove box to release the pop tab. Repeat on the right side. 6. Carefully lower the glove box assembly. 7. Disconnect the electrical connection to the trunk disable button 8. The entire glove box can now be removed from the area. The door gear assembly does not come off of the box and is easily damaged if attempted to do so. 9. The Cabin Air Filter assembly has a white cover. Pop the tabs on the right and left side and slide the assembly out. 10. Replace the filter in the assembly. Make sure the airflow indicator points down. 11. Re-Install Air Filter assembly. 12. Re-Install the electrical connections remembering to slide the one through the hole in the top of the glove box. 13. Push glove box assembly on pop tabs. 14. Re-Install screws and bolts. 15. Reconnect the black cover plate to the top of the glove box. rate it

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It sounds to me if you are having a "musty smell" then you might have a problem with your condensation drain line for you a/c system or a small leak on your heater core. If it is plugged then water will collect in the vent system causing a musty smell from the water not draining and if there is a small leak on the heater core then coolant can collect in the vent system. I would run the a/c on a warm day and look for water draining from the vehicle around where the dash is located to check the drain line. As far as your air cabin filter most are located behind the glove box. You usually need to remove the glove box to get to the filter.

If you run your Air cond on recirculate always try using an air sanitizer in your return vent. Or switch your A/C to outside air flow for for half an hour and raise the rear of your sunroof panel to vent the stale air do this till the smell dissipates and then close he sunroof and reset the A/C to recirculate if desired.

cabin air filter is inside a compartment behind your glove box. pretty simple to fix if you can figure out how to take off your glove box door. the filter is little different than the air filter, thinner. May help to spray some Frigi-freeze or Fridgi-Fresh stuff on it to help kill bacteria. an auto parts store should have some for the a/c system.

It also helps to spray some Fridgi-Fresh or Fridgi-Freeze stuff on the cabin air filter and into the A/C condensor. It kills the odor causing bacteria. A local auto parts store should stock it. Might run you about $20 for a bottle of it.